/*
 If you are using fmdb in your project, I'd love to hear about it.  Let me 
 know at gus@flyingmeat.com.
 
 In short, this is the MIT License.
 
 Copyright (c) 2008 Flying Meat Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */ 

#import "FMResultSet.h"
#import "FMDatabase.h"

@interface FMResultSet (Private)
- (NSMutableDictionary *)columnNameToIndexMap;
- (void)setColumnNameToIndexMap:(NSMutableDictionary *)value;
@end

@implementation FMResultSet

+ (id) resultSetWithStatement:(FMStatement *)statement usingParentDatabase:(FMDatabase*)aDB {
    
    FMResultSet *rs = [[FMResultSet alloc] init];
    
    [rs setStatement:statement];
    [rs setParentDB:aDB];
    
    return rs;
}

- (id)init {
	self = [super init];
    if (self) {
        [self setColumnNameToIndexMap:[NSMutableDictionary dictionary]];
    }
	
	return self;
}


- (void)dealloc {
    [self close];
    
    query = nil;
    
    columnNameToIndexMap = nil;
    
}

- (void) close {
    
    [statement reset];
    statement = nil;
    
    [parentDB setInUse:NO];
    parentDB = nil; // parentDB is never retained, so no need for a release.
}

- (void) setupColumnNames {
    
    int columnCount = sqlite3_column_count(statement.statement);
    
    int columnIdx = 0;
    for (columnIdx = 0; columnIdx < columnCount; columnIdx++) {
        [columnNameToIndexMap setObject:[NSNumber numberWithInt:columnIdx]
                                 forKey:[[NSString stringWithUTF8String:sqlite3_column_name(statement.statement, columnIdx)] lowercaseString]];
    }
    columnNamesSetup = YES;
}

- (void) kvcMagic:(id)object {
    
    
    int columnCount = sqlite3_column_count(statement.statement);
    
    int columnIdx = 0;
    for (columnIdx = 0; columnIdx < columnCount; columnIdx++) {
        
        
        const char *c = (const char *)sqlite3_column_text(statement.statement, columnIdx);
        
        // check for a null row
        if (c) {
            NSString *s = [NSString stringWithUTF8String:c];
            
            [object setValue:s forKey:[NSString stringWithUTF8String:sqlite3_column_name(statement.statement, columnIdx)]];
        }
    }
}

- (BOOL) next {
    
    int rc;
    BOOL retry;
    int numberOfRetries = 0;
    do {
        retry = NO;
        
        rc = sqlite3_step(statement.statement);
        
        if (SQLITE_BUSY == rc) {
            // this will happen if the db is locked, like if we are doing an update or insert.
            // in that case, retry the step... and maybe wait just 10 milliseconds.
            retry = YES;
            usleep(20);
            
            if ([parentDB busyRetryTimeout] && (numberOfRetries++ > [parentDB busyRetryTimeout])) {
                
                NSLog(@"%s:%d Database busy (%@)", __FUNCTION__, __LINE__, [parentDB databasePath]);
                NSLog(@"Database busy");
                break;
            }
        }
        else if (SQLITE_DONE == rc || SQLITE_ROW == rc) {
            // all is well, let's return.
        }
        else if (SQLITE_ERROR == rc) {
            NSLog(@"Error calling sqlite3_step (%d: %s) rs", rc, sqlite3_errmsg([parentDB sqliteHandle]));
            break;
        } 
        else if (SQLITE_MISUSE == rc) {
            // uh oh.
            NSLog(@"Error calling sqlite3_step (%d: %s) rs", rc, sqlite3_errmsg([parentDB sqliteHandle]));
            break;
        }
        else {
            // wtf?
            NSLog(@"Unknown error calling sqlite3_step (%d: %s) rs", rc, sqlite3_errmsg([parentDB sqliteHandle]));
            break;
        }
        
    } while (retry);
    
    
    if (rc != SQLITE_ROW) {
        [self close];
    }
    
    return (rc == SQLITE_ROW);
}

- (int) columnIndexForName:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    columnName = [columnName lowercaseString];
    
    NSNumber *n = [columnNameToIndexMap objectForKey:columnName];
    
    if (n) {
        return [n intValue];
    }
    
    NSLog(@"Warning: I could not find the column named '%@'.", columnName);
    
    return -1;
}



- (int) intForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return 0;
    }
    
    return sqlite3_column_int(statement.statement, columnIdx);
}
- (int) intForColumnIndex:(int)columnIdx {
    return sqlite3_column_int(statement.statement, columnIdx);
}

- (long) longForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return 0;
    }
    
    return sqlite3_column_int64(statement.statement, columnIdx);
}

- (long) longForColumnIndex:(int)columnIdx {
    return sqlite3_column_int64(statement.statement, columnIdx);
}

- (BOOL) boolForColumn:(NSString*)columnName {
    return ([self intForColumn:columnName] != 0);
}

- (BOOL) boolForColumnIndex:(int)columnIdx {
    return ([self intForColumnIndex:columnIdx] != 0);
}

- (double) doubleForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return 0;
    }
    
    return sqlite3_column_double(statement.statement, columnIdx);
}

- (double) doubleForColumnIndex:(int)columnIdx {
    return sqlite3_column_double(statement.statement, columnIdx);
}


#pragma mark string functions

- (NSString*) stringForColumnIndex:(int)columnIdx {
    
    const char *c = (const char *)sqlite3_column_text(statement.statement, columnIdx);
    
    if (!c) {
        // null row.
        return nil;
    }
    
    return [NSString stringWithUTF8String:c];
}

- (NSString*) stringForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return nil;
    }
    
    return [self stringForColumnIndex:columnIdx];
}




- (NSDate*) dateForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return nil;
    }
    
    return [NSDate dateWithTimeIntervalSince1970:[self doubleForColumn:columnName]];
}

- (NSDate*) dateForColumnIndex:(int)columnIdx {
    return [NSDate dateWithTimeIntervalSince1970:[self doubleForColumnIndex:columnIdx]];
}


- (NSData*) dataForColumn:(NSString*)columnName {
    
    if (!columnNamesSetup) {
        [self setupColumnNames];
    }
    
    int columnIdx = [self columnIndexForName:columnName];
    
    if (columnIdx == -1) {
        return nil;
    }
    
    int dataSize = sqlite3_column_bytes(statement.statement, columnIdx);
    
    NSMutableData *data = [NSMutableData dataWithLength:dataSize];
    
    memcpy([data mutableBytes], sqlite3_column_blob(statement.statement, columnIdx), dataSize);
    
    return data;
}

- (NSData*) dataForColumnIndex:(int)columnIdx {
    
    int dataSize = sqlite3_column_bytes(statement.statement, columnIdx);
    
    NSMutableData *data = [NSMutableData dataWithLength:dataSize];
    
    memcpy([data mutableBytes], sqlite3_column_blob(statement.statement, columnIdx), dataSize);
    
    return data;
}


- (void)setParentDB:(FMDatabase *)newDb {
    parentDB = newDb;
}


- (NSString *)query {
    return query;
}

- (void)setQuery:(NSString *)value {
    query = value;
}

- (NSMutableDictionary *)columnNameToIndexMap {
    return columnNameToIndexMap;
}

- (void)setColumnNameToIndexMap:(NSMutableDictionary *)value {
    columnNameToIndexMap = value;
}

- (FMStatement *) statement {
    return statement;
}

- (void)setStatement:(FMStatement *)value {
    if (statement != value) {
        statement = value;
    }
}



@end
